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Synthesis of Al2O3–SiC from kyanite precursor

Published online by Cambridge University Press:  31 January 2011

A. Amroune  and
G. Fantozzi
A. Amroune
Affiliation:
Ceramics and Composites Research Group, GEMPPM Bat Blaise Pascal, INSA de Lyon, 69621 Villeurbanne Cedex, France
G. Fantozzi
Affiliation:
Ceramics and Composites Research Group, GEMPPM Bat Blaise Pascal, INSA de Lyon, 69621 Villeurbanne Cedex, France
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Abstract

Carbothermal reduction of kyanite, a natural aluminosilicate with high alumina content (Al2O3 · SiO2), was used as a way to synthesize SiC–Al2O3 powder. Carbon black was mixed with the mineral precursor in a molar ratio of (C/SiO2) = 5.5. The Carbothermal reaction sequence was studied in the temperature range 1260–1550 °C. Completion of the reaction at 1550 °C gave β–SiC-whiskers and α–Al2O3 particles as final products. From observations, the impurities contained in the mineral precursor behave as catalysts for the vapor–liquid–solid whisker growth mechanism. When the specific surface area of the starting carbon was increased from 330 to 996 m2/g, the carbothermal reaction rate increased but the morphology of the SiC-whiskers became very irregular. This study aimed to identify the main reaction conditions for obtaining a favorable morphology of the synthesized powder for elaborating Al2O3–SiC-whisker composite materials by using low cost starting materials and a relatively simple in situ synthesis route in comparison to the conventional way of separately preparing the phases SiC (whiskers) and Al2O3 before elaborating composites.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 6 , June 2001 , pp. 1609 - 1613
Copyright
Copyright © Materials Research Society 2001

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